2019/02/10 by L. Massacrier, Massacrier, L.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.1902.03637
openalex publication_date 2019/02/10 · openalex created_date 2019/07/12 · openalex updated_date 2026/07/28
The photoproduction of heavy vector mesons in the electromagnetic interactions of ultra-relativistic nuclei is sensitive to the gluon distribution in the nucleus and thus to cold nuclear matter effects like shadowing or parton saturation. Besides the well known observations of vector meson production in ultra-peripheral collisions, first observations of an excess over the expected hadronic J/ψ production at very low transverse momentum (pT < ~0.3 GeV/c) in peripheral and semi-central nucleus-nucleus collisions both at LHC and RHIC energies were interpreted as the first sign of coherent J/ψ photoproduction occurring in Pb-Pb collisions with nuclear overlap. The ALICE Collaboration published the J/ψ coherent photoproduction cross sections in peripheral and semi-central Pb-Pb collisions at √s\rm NN = 2.76~TeV and forward rapidity (2.5